All-solid-state battery

Abstract

An all-solid-state battery is provided. The all-solid-state battery comprises a positive electrode, a negative electrode and a solid electrolyte membrane between the positive electrode and the negative electrode, and further comprises a first composite carbon layer and a second composite carbon layer between the negative electrode and the solid electrolyte membrane.

1 . An all-solid-state battery; comprising:
 a positive electrode;   a negative electrode; and   a solid electrolyte membrane between the positive electrode and the negative electrode,   wherein the all-solid-state battery further comprises a first composite carbon layer and a second composite carbon layer between the negative electrode and the solid electrolyte membrane.   
     
     
         2 . The all-solid-state battery according to  claim 1 , wherein the first composite carbon layer is disposed adjacent to one surface of the solid electrolyte membrane, and the second composite carbon layer is disposed adjacent to one surface of the negative electrode. 
     
     
         3 . The all-solid-state battery according to  claim 1 , wherein each of the first composite carbon layer and the second composite carbon layer contains a carbon material and a binder, and
 wherein a content of the binder in the first composite carbon layer and a content of the binder in the second composite carbon layer are different from each other.   
     
     
         4 . The all-solid-state battery according to  claim 3 , wherein a weight ratio of the carbon material to the binder in the first composite carbon layer is 80:20 to 95:5, and a weight ratio of the carbon material to the binder in the second composite carbon layer is 95:5 to 99:1. 
     
     
         5 . The all-solid-state battery according to  claim 1 , wherein a thickness ratio of the first composite carbon layer to the second composite carbon layer is from 20:1 to 1:1. 
     
     
         6 . The all-solid-state battery according to  claim 1 , wherein a thickness of the first composite carbon layer is 5 to 20 μm, and a thickness of the second composite carbon layer is 1 to 5 μm. 
     
     
         7 . The all-solid-state battery according to  claim 1 , wherein the solid electrolyte membrane is any one selected from the group consisting of Li 2 S—P 2 S 5 , Li 2 S—LiI—P 2 S 5 , Li 2 S—P 2 S 5 —LiCl, Li 2 S—LiI—Li 2 O—P 2 S 5 , Li 2 S—LiBr—P 2 S 5 , Li 2 S—Li 2 O—P 2 S 5 , Li 2 S—Li 3 PO 4 —P 2 S 5 , Li 2 S—P 2 S 5 —P 2 O 5 , Li 2 S—P 2 S 5 —SiS 2 , Li 2 S—P 2 S 5 —SnS, Li 2 S—P 2 S 5 —Al 2 S 3 , Li 2 S—GeS 2 , and Li 2 S—GeS 2 —ZnS, Li 6 PS 5 Cl, Li 10 GeP 2 S 12 , Li 3 PS 4 , Li 7 P 3 S 11  and combinations thereof. 
     
     
         8 . The all-solid-state battery according to  claim 1 , wherein the solid electrolyte membrane comprises a sulfide-based solid electrolyte of an argyrodite structure. 
     
     
         9 . The all-solid-state battery according to  claim 1 , wherein the positive electrode comprises a positive electrode active material and a solid electrolyte. 
     
     
         10 . The all-solid-state battery according to  claim 3 , wherein the carbon material includes one selected from the group consisting of graphite, graphene, carbon black, carbon nanotubes, carbon fibers, activated carbon, and combinations thereof. 
     
     
         11 . The all-solid-state battery according to  claim 3 , wherein the binder is one selected from the group consisting of poly(vinyl acetate), polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, alkylated polyethylene oxide, crosslinked polyethylene oxide, polyvinyl ether, poly(methyl methacrylate), polyvinylidene fluoride (PVDF), a copolymer of polyhexafluoropropylene and polyvinylidene fluoride, poly(ethylacrylate), polytetrafluoroethylene, polyvinylchloride, polyacrylonitrile, polyvinylpyridine, polystyrene, styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC) and combinations thereof.